Add py34 to readme, pkg metadata, and envlist

This commit adds references explaining the current state of python 3.4
and tempest to the readme, pkg metadata, and adds an etry to the tox
envlist for running the unit tests on python 3.4.

Change-Id: I9c1e3cdf53dbae723a9fee67ad96932709d2305f
diff --git a/tox.ini b/tox.ini
index 88d1302..2d2ed38 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = pep8,py27
+envlist = pep8,py27,py34
 minversion = 1.6
 skipsdist = True